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Thanks for the reply. What I mean is that if it would increase the reduction rating even more if I will coat it with silicone caulk and then maybe add some extra materials like mass loaded vinyl on top of the foams, or at the bottom?

Edited: Sorry, I just reread your reply and I misunderstood it the first time. Thanks for the help. What do you think is better at blocking low and mid frequency sounds, soundproofing mat or mass vinyl? Also, if it's alright, could you please give me an example of an earmuff with the additional foam that you were talking about and how much noise did it remove?

Thanks. I had an earmuff myself. Clear Armor to be more specific which isolates as well. I was just trying to achieve the 37-40db(?) noise reduction from it since I had read that it would be the most maximum(?) noise reduction that could be obtained when covering the ears(?). I was thinking of a DIY ways to obtain that. From your experience is are there ways to achieve those noise reduction rating in a DIY ways?

I'm also wondering how did the etymotics research products obtain those nrr themselves? Since from what I've read the tri flange could reduce up to 25db by average and it seems like when you use those flange in their earphone you can achieve at least 35db(?) Could you please share me your views about this?

I was trying to isolate as much noise as I can ( on the low, mid and high freq), but I guess your explanation had shed a light on my questions. I would just like to ask another thing. Are there any materials that I can use to filter out the low and mid frequencies? I mean, something that I could add on an earmuff if it's possible? Or it can only be done by completely soundproofing a room?